After doing mostly local crag rock climbing in college, I didn't do much hiking or climbing until my mid 30s. At 40 I started trail hiking (The Vermont Long Trail), and at 46 I started hiking in the Adirondacks. Started peakbagging after about a dozen people asked "are you working on your 46" (my initial answer was "46 what?"), doing first the Adirondack 46, then moving on to AMC lists (NH 4000 footers, NE 4000 footers, and now NE hundred highest).